*[`isohybrid`](https://build.opensuse.org/request/show/868912)(toolchain, fix random MBR ID for ipxe.iso)
* Drew DeVault wrote a blog post [How to make your downstream users happy](https://drewdevault.com/2021/02/09/How-to-make-your-downstreams-happy.html) which among other things pointed out SOURCE_DATE_EPOCH.